n.难题；脑筋急转弯
brainteaser例句
用作名词(n.)
If you fill in squares correctly, options for the remaining ones are narrowed and it becomes easier to solve this brainteaser.
如果你正确地填充了方框，剩余的选择范围会缩小同时解决这个难题也就越简单。
brainteaser近义词
problem
puzzle
riddle
challenge
conundrum
mystery